Create a test-e2e.sh script which prow can run

[fejta]

/assign @erain

• Check in the hellohttp service
• Update The hellohttp, hellogrpc test scripts to
  • accept a list of languages (rather than just one)
  • ensure the service exists
  • print out all the app's resources before deletion
• Create a top-level test-e2e.sh that runs all the e2e tests
  • essentially a clone of .travis.yml
  • will be used by prow

[k8s-ci-robot]

Hi @fejta. Thanks for your PR.

I'm waiting for a bazelbuild member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[fejta]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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